Update actions/deploy-pages action to v2

Author: renovate[bot]

.github/workflows/deploy-site.yml

@@ -63,4 +63,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v1
+        uses: actions/deploy-pages@9dbe3824824f8a1377b8e298bafde1a50ede43e5 # v2